This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A nostalgic bibliographic gem.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

The walls of the iconic dome are hollow and have a secret stairway.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

An overlooked tribute to one of the most important peace deals in American history.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

People escaping slavery may have hidden inside a corpse vault.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

A rotating cast of guys and dolls in front of a Washington, D.C. building.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.